What is the significance of Kenyanthropus, a 3.5-million-year-old fossil that Maeve Leakey discovered in Kenya in 1999?
A. It puts an end to the debate between taxonomic "splitters" and "lumpers."
B. It confirms that the development of big brains preceded the onset of bipedalism.
C. It replaces Lucy (3.2 m.y.a.) as the earliest known hominin skeleton.
D. It is the ancestor of Homo but not australopithecines.
E. It suggests the possibility that at least two hominin lineages existed as far back as 3.5 million years ago.
Answer: E
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